Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The structures of La 0.7 Ca 0.11 Sr 0.19 MnO 3, La 0.32 Pr 0.38 Sr 0.3 MnO 3, Pr 0.7 Sr 0.23 Ba 0.07 MnO 3, and Nd 0.7 Sr 0.16 Ba 0.14 MnO 3 have been refined from 4 K powder neutron diffraction data. These samples have all the same doping level and mean A cation size radius, but the A cation size variance σ 2 increas…
The effect of large-amplitude oscillatory shear flow on a concentrated block copolymer solution with lamellar order was studied by in-situ small-angle neutron scattering. Microstructural changes were studied as a function of temperature, frequency of the oscillatory flow field, and thermal history prior to turning on…
Solid−liquid equilibria of 14 binary systems containing various amides or sulfolane with organic compounds have been measured by a visual technique. The substances investigated are important and often used as selective solvents in the chemical industry, for example for extractive distillation or extraction. Assuming e…
Complex formation between a carboxyl-terminated cascade polymer (generation 3) and several cationic polyelectrolytes of varying linear charge density was studied as a function of ionic strength, by turbidimetric titration and dynamic light scattering. Tetramethylammonium chloride was used to adjust the ionic strength…
A three-dimensional polybead model of the structure and large strain deformation of amorphous polymeric networks is constructed and evolved via Monte Carlo techniques. The model has successfully simulated various deformation conditions and been found to qualitatively capture the proper state of deformation, rate of de…
Copper in the form of nanoparticles and microsized fibers was synthesized by using carbon nanotubes as a template. The size of the copper nanoparticles was controllable in the range between a few and tens of nanometers, depending on the diameter of carbon nanotubes and the preparation conditions. They could be detache…
A new way for preparation of microporous silica containing metal nanoparticles inside pores is described. Special amphiphilic block copolymers, polybutadiene-b-poly(ethylene oxides), are used in a first step as nanoreactors for the preparation of metal nanoparticles inside their micelle cores and then as templates whe…
Huge built-in electric fields have been predicted to exist in wurtzite III-V nitrides thin films and multilayers. Such fields originate from heterointerface discontinuities of the macroscopic bulk polarization of the nitrides. Here we discuss the background theory, the role of spontaneous polarization in this context,…
The solvation of Al and its hydrolyzed species in water clusters has been studied by means of ab initio molecular dynamics simulations. The hexa-hydrate aluminum ion formed a stable complex in the finite temperature cluster simulation of one aluminum ion and 16 waters. The average dipole moment of strongly polarized h…
An introduction to the Propp-Wilson method of coupling-from-the-past for the Ising model is presented. It enables one to obtain exact samples from the equilibrium spin distribution for ferromagnetic interactions. Both uniform and random quenched magnetic fields are included. The time to couple from the past and its st…
Mesoporous silica SBA-15 molecular sieve has been synthesized and incorporated with aluminum via three different postsynthesis procedures by reacting SBA-15 with AlCl 3 in dry ethanol (route 1), with aluminum isopropoxide in dry hexane (route 2) and with an aqueous solution of sodium aluminate (route 3) followed by ca…
Using a novel thin film polymerization technique, we have observed the phase separation, coalescence, and annihilation of liquid crystal textures during polymerization of wholly aromatic main-chain liquid crystalline polymer poly( p -oxybenzoate/2,6-oxynaphthoate) (P(OBA/ONA)). The polycondensation reaction was conduc…
A calcium carbonate (CaCO 3 ) sorbent synthesized in the presence of surface modifiers has recently been developed in this laboratory for the purpose of enhancing the reactivity toward SO 2 at high temperatures (800−1150 °C). The calcium carbonate particles are produced by precipitation from an aqueous suspension of c…
A new class of metal sandwich complexes of silver derived from silver(I) perchlorate and fluoranthene (L 1 ), benzo[ ghi ]perylene (L 2 ), [2,2]paracyclophane (L 3 ), and decacyclene (L 4 ) was prepared. The idea behind the use of polycyclic aromatic compounds as an alternative approach for construction of organometal…
We have performed voltage dependent imaging and spatially resolved spectroscopy on the (110) surface of Te doped GaAs single crystals with a low temperature scanning tunneling microscope (STM). A large fraction of the observed defects are identified as Te dopant atoms which can be observed down to the fifth subsurface…
We investigate the phase diagram of an extended Kondo lattice model for doped manganese oxides in the presence of strong but finite Hund's coupling and on-site Coulomb interaction. By means of the Schwinger-boson mean-field approach, it is found that, besides magnetic ordering, there will be non-uniform charge distrib…
We have used a low-temperature scanning tunneling microscope (STM) to study the surface of heavily doped semiconductor InAs crystals. The crystals are cleaved in situ along the (110) plane. Apart from atomically flat areas, we also observe two major types of atomic scale defects which can be identified as S dopant ato…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Although the increasing amount of unburned carbon in fly ash is known to impede the efficient use of ash in the cement industry, very little is known about the characteristics of the unburned carbon. Three different types of carbon particles have been identified microscopically: inertinite, isotropic coke, and anisotr…
Alignment of hexagonal mesoporous silica particles was achieved by a simple rubbing method used for the alignment of liquid crystals on a very thin polyimide film coated on a silica glass substrate. Mesoporous silica was synthesized through the hydrolysis of tetraethoxysilane under acidic conditions in the presence of…